Artists work on sand sculptures for an event welcoming the G20 Summit in Zhoushan, Zhejiang Province, China, August 28, 2016. (Photo by Reuters/China Daily)

People pose for photos on an empty road near the West Lake, as police closed off many roads before G20 Summit in Hangzhou, Zhejiang Province, China August 31, 2016. (Photo by Aly Song/Reuters)

Security personnel ride bicycles on an empty road near the West Lake, as police closed off many roads before G20 Summit in Hangzhou, Zhejiang Province, China August 31, 2016. (Photo by Aly Song/Reuters)

A man poses for photos on an empty road near the West Lake, as police closed off many roads before G20 Summit in Hangzhou, Zhejiang Province, China August 31, 2016. (Photo by Aly Song/Reuters)

Security personnel keep watch at a subway station before G20 Summit in Hangzhou, Zhejiang province, China September 1, 2016. (Photo by Aly Song/Reuters)

A man rides a tricycle cart on a street before the G20 Summit in Hangzhou, Zhejiang province, China September 1, 2016. (Photo by Aly Song/Reuters)

People cycle past a billboard for the upcoming G20 summit on street in Hangzhou, Zhejiang province, China September 1, 2016. (Photo by Aly Song/Reuters)

Security personnel try to stop a man as they close the West Lake before the G20 Summit in Hangzhou, Zhejiang province, China September 1, 2016. (Photo by Aly Song/Reuters)

The plane carrying Brazil's President Michel Temer arrives at the Hangzhou Xiaoshan international airport before the G20 Summit in Hangzhou, Zhejiang province, China September 2, 2016. (Photo by Aly Song/Reuters)

Honour guards march after welcoming Canadian Prime Minister Justin Trudeau (unseen) at the Hangzhou Xiaoshan international airport before the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Damir Sagolj/Reuters)

Security personnel patrol as they close the West Lake before the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Aly Song/Reuters)

Honour guards stand at attention at the Hangzhou Xiaoshan international airport as leaders arrive for the G20 Summit in Hangzhou, Zhejiang province, China, September 3, 2016. (Photo by Damir Sagolj/Reuters)

Honour guards stand at attention before the arrival of U.S. President Barack Obama (not pictured) at Hangzhou Xiaoshan international airport before the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Damir Sagolj/Reuters)

Security agents run alongside the car transporting Egypt's President Abdel Fattah al-Sisi as he arrives at Hangzhou Xiaoshan international airport before the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Damir Sagolj/Reuters)

Honour guards stand in line as the plane carrying Egypt's President Abdel Fattah al-Sisi arrives at Hangzhou Xiaoshan international airport before the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Damir Sagolj/Reuters)

Honour guards move before China's President Xi Jinping and U.S. President Barack Obama hold a bilateral meeting ahead of the G20 Summit, at West Lake State Guest House in Hangzhou, China September 3, 2016. (Photo by Jonathan Ernst/Reuters)

People watch U.S. President Barack Obama's motorcade as he arrives for the G20 Summit in Hangzhou, China September 3, 2016. (Photo by Jonathan Ernst/Reuters)

Chinese military honour guards march on the tarmac of Hangzhou Xiaoshan international airport as leaders arrive for the G20 Summit in Hangzhou, Zhejiang province, China September 3, 2016. (Photo by Damir Sagolj/Reuters)

A Chinese volunteer poses for a photo in front of Air Force One after U.S. President Barack Obama arrived at the Hangzhou Xiaoshan International Airport, Saturday, September 3, 2016, in Hangzhou, China, to attend the G-20 summit. Obama is expected to meet with China's President Xi Jinping Saturday afternoon. (Photo by Mark Schiefelbein/AP Photo)